Nice app, Mags! Thanks for posting it for our enjoyment.
As Mags posted, you need an open profile (also works for public/green lock level) for it to work. Access to higher privacy levels is, of course, blocked.
My test worked well through Sixth Generation, but it did not fill in any Seventh Generation profiles that I know are connected. Since those profiles should be open, perhaps there is a flaw or glitch in the program.
For comparison, I use the Firefox browser with tight security and privacy settings, as well as other restrictions through add-ons like NoScript, Flashblock, and Ghostery. No changes were needed except to allow the script for herokuapp.com .